private void Textbox_TextChanged(object sender, TextChangedEventArgs e)
{
var stextBox = sender as RichTextBox;
var textBox = new TextRange(stextBox.Document.ContentStart, stextBox.Document.ContentEnd);
if (textBox != null)
{
if (textBox.Text != "")
{
expression = new Expression(textBox.Text);
var paras = GetParametersInExpression(textBox.Text).Distinct().ToList();
if (paras.Any())
{
RemoveAllInputPortsFromNode(paras);
var filteredParas = paras.Where(parameter => InputPorts.All(p => p.Name != parameter)).ToList();
foreach (var parameter in filteredParas)
{
AddInputPortToNode(parameter, typeof(object));
}
}
}
else
{
expression = null;
RemoveAllInputPortsFromNode();
}
}
Calculate();
}